Anyone know why my reflection is appearing noisy/weird
Without looking at the nodes for the floor it's hard to be sure, but it looks like you gave the floor material a little bit of Roughness, which creates noise that becomes &quot;blotchy&quot; when the Denoiser tries to fix it.
Options you can try:

Set Roughness to zero (unless you really really wanted it)
Increase the samples of your render (if you can wait)
Stop using the built-in denoiser and use the compositor Denoiser instead (if you can't wait AND need the roughness to stay the way it is)